JPS62163054A - Antistatic light shading masking film - Google Patents

Abstract

PURPOSE:To improve strength of a strippable layer and to prevent tackiness of the surface and sticking of a dye or pigment to the surface of a plastic film support by incorporating an antistatic agent solid at normal temperature in the strippable layer. CONSTITUTION:The strippable layer contains the antistatic agent solid at normal temperature, such as a solid surfactant and an organoboron compound, and as the practicable surfactant, glycerin stearate is preferable because it does not so much affect the adhesiveness of the strippable layer. Its suitable adhesiveness and its moderate strippability can be maintained by adjusting a proportion of glycerin mono-, di-, and tri-stearates. The antistatic agent is added, preferably, in an amount of 0.5-10wt% of the total solid of the strippable layer.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to an antistatic light-shielding masking film comprising a light-shielding release layer provided on one side of a plastic film support. This is an antistatic light-shielding masking film in which a fin layer is provided on one side of a high-quality plastic film.

(b) Conventional technology A light-shielding masking film is composed of a light-shielding release layer provided on a light-transmitting plastic film support, and by partially peeling off the release layer, the peeled portion can be removed. Since it is translucent, it is used in photoengraving etc. by taking advantage of this property.

The characteristics required for a light-shielding masking film are:
■The strength of the release layer is high.■The light transmittance of the plastic film support is good.■The peelability of the release layer is excellent.■Even if the release layer is cut with a cutter knife, it will not work. Required characteristics include: no lifting on the peeled part, ■ sharp cut of the peeled layer with a cutter knife, ■ excellent light shielding properties, ■ flexibility, and ■ ability to obtain precise photographic objects. In addition, in particular, it is necessary that (1) the light-shielding masking film is not charged and dust does not adhere to it during production or use, and that the surface of the qΦ coating is not sticky.

Therefore, an antistatic light-shielding masking film has been proposed, which is made by coating a nitrile rubber composition containing an ionic antistatic agent on a plastic support.
(Japanese Unexamined Patent Publication No. 108537/1983).

(c) Problems to be Solved by the Invention However, the above-mentioned ionic antistatic agent is liquid at room temperature, and not only bleeds onto the surface and becomes sticky, causing blocking, but also oozes out dyes and pigments in the release layer. There is a problem in that this oozing dye/pigment transfers to the surface of the transparent plastic film support and deteriorates its transparency.

(,,I) Means to resolve the problem The inventors of the present invention have made extensive studies to solve the above problem, and as a result, have found the following:
A release layer provided on one side of the plastic film support,
discovered that it contains an antistatic agent that is solid at room temperature,
This has led to the completion of the present invention.

That is, the present invention is a light-shielding masking film comprising a release layer mainly made of thermoplastic plastic, rubber, or a mixture thereof on one side of a light-transmitting plastic film support, and the release layer has a temperature of room temperature. It is characterized by containing a solid antistatic agent.

The present invention will be explained in detail below.

As the plastic film support used in the present invention, as long as it has good translucency and flexibility,
It does not matter whether it is a stretched film or an unstretched film.

Typical examples of such plastic film supports include polyester films such as polyethylene terephthalate, polybutylene terephthalate, and polyoxybenzoate, polycarbonate films, and polypropylene films.

In addition, the thermoplastic plastics used in the present invention include polyvinyl chloride, vinyl chloride resins such as vinyl chloride-vinyl acetate copolymers, nitrocellulose, polyacrylate resins, polyamides, and polyacetals.
Examples include resins selected from rubber, polystyrene resins, polyester resins, etc. Among these, resins that are compatible with the rubbers described later, are transparent, and are not sticky at room temperature are preferred; from this point of view, Vinyl chloride resin is most desirable.

The vinyl chloride resin used is one that is compatible with the rubber described below and is not sticky at room temperature. Such vinyl chloride resin usually has a polymerization degree of 500 to 1000.
A preferred specific example thereof is vinyl chloride-vinyl acetate copolymer (vinyl chloride-vinyl acetate copolymer).
Vinyl chloride homo/mer 85-95% by weight, vinyl acetate 15
~5% by weight)'''!?

Further, the rubber used in the present invention may be either synthetic rubber, natural rubber, etc., and is appropriately selected from those suitable for adhesion to the plastic film support used. - Among these, synthetic rubber is preferable, and the most preferable are Nidomorpha, Lugo people and Uredango people? 71
11 n, i1. ■tnUjl A material with excellent adhesive properties is desirable.

As the above-mentioned acrylic rubber, those having good adhesiveness and UV resistance are particularly preferably used. The acrylic ester constituting the acrylic rubber is preferably an alkyl (preferably carbon number 1 to 4) ester such as ethyl acrylate or butyl acrylate, and other components include acrylonitrile and the like. .

A specific example of acrylic rubber is a butyl acrylate-acrylonitrile copolymer, whose composition ratio is 85 to 90% by weight of butyl acrylate, 9.5 to 15% by weight of acrylonitrile, and 0% of 2-hydroxyethyl methacrylate. It is preferable that it is .5 to 2% by weight, and its molecular weight is preferably 100,000 to 600,000 (number average molecule ff1 measured by del permeation chromatography using polystyrene as a reference material)c.

The mixing ratio of the thermoplastic plastic (A) and rubber (B) is usually in the range of 50 to 80% by weight, preferably 60 to 7% by weight, based on the total solid content of (A+8).
A range of 0% by weight is desirable.

If (B) is too small, less than 50% by weight, plasti.

The adhesion to the support is poor and the release layer may peel off easily.On the other hand, if (B) exceeds 80% by weight, the characteristics of rubber will become apparent and the degree of elongation of the release layer will increase. This is not desirable because it makes the work difficult.

In the present invention, light-shielding dyes and pigments are blended in order to impart light-shielding properties to the release layer, but such dyes and pigments include:
Dyes and pigments that are soluble in organic solvents, compatible with the above-mentioned mixed resin of rubber and thermoplastic, and have light-shielding properties are used. Preferably, it is stable and shows little change in color tone.

Further, the color tone and structure of the dye/pigment are not particularly limited.

The blending ratio of the dye/pigment may be any amount sufficient to exhibit light-shielding properties, and is generally 0.5 to 10 parts by weight based on 100 parts by weight of the resin solid content in the mixed resin. be. Examples of such light-shielding dyes/pigments include oil-soluble dyes, organic solvent-soluble dyes, metal complex dyes, and organic pigments.

The release layer used in the present invention has the following ingredients:
Contains an antistatic agent that is solid at room temperature.

Examples of the antistatic agent include solid surfactants and organic boron compounds. As a specific example of the surfactant, glycerin stearate is preferred because it does not significantly affect the adhesiveness of the release layer. In order to appropriately adjust the adhesive strength of the release layer and maintain a certain level of release properties, the proportions of glycerin stearate monoester, glycerin stearate diester, and glycerin stearate triester can be adjusted.

In addition, sodium alkyl sulfonate, polyoxyethylene stearyl ether, N,N-dihydroxyethyl laurylamide, cationic acrylic polymer, etc. can be used depending on the type of thermoplastic plastic ivy or rubber used.
Used alone or in combination of two or more.

The preferred amount of the antistatic agent is sufficient to prevent the generation of static electricity, and is generally preferably 0.5 to 10% by weight based on the solid content in the release layer.

If the amount is less than 0.5% by weight, the expected antistatic effect will not be obtained, while if it exceeds 10% by weight, it will have an adverse effect on the physical properties of the entire release layer, which is undesirable.A particularly preferred amount is 1. A range of 0 to 6.0% is desirable.

It is preferable that a matting agent is added to the release layer for the purpose of preventing light reflection. As the matting agent, particles having a matting ability (for example, hydrated amorphous silicon) having a particle size of 10 μm or less are used.

The blending amount of the matting agent is about 0.5 to 3% by weight, preferably 0.75 to 2% by weight based on the resin content in the release layer.
That's about it. If the blending amount is less than 0.5% by weight, there will be no matting effect, and on the other hand, 3irI 猾oA, along with super tem toyan sha 1betsu 1 彰 1 - SENJI ftl totos, will have a negative effect on the cutter due to the matting agent. This is not preferable because the knife blade wears out quickly and the visible light transmittance of the light-shielding layer deteriorates, causing problems in layout work and the like.

The antistatic light-shielding masking film of the present invention is made of resin made of, for example, thermoplastic plastic, rubber, light-shielding injection dyeing/pigment, etc. The IL composition was dissolved in a solvent such as acetone, methyl ethyl ketone, toluene, xylene, or a mixed solvent thereof, and the resulting composition was further mixed with other amounts, and the resulting composition was applied to one side of a plastic film support. , for example, by coating with a roll coater to form a release layer.

(e) The antistatic light-shielding masking film of the present invention for one use uses an antistatic agent that is solid at room temperature, so the release layer does not become sticky and the dye/pigment in the release layer does not ooze out. Moreover, the solid antistatic agent has the effect of preventing the generation of static electricity.

(f) Examples Hereinafter, the present invention will be explained in detail based on Examples, but the present invention is not limited thereto.

Example 1 A biaxially stretched polyethylene terephthalate film (thickness 100μI) was used as a transparent plastic film support.
l+) was used.

On the other hand, 40 parts by weight of acrylic rubber (molecular weight approximately 100,000) consisting of 1% by weight of 2-hydroxy methacrylate, 12% by weight of acrylonitrile, and 87% by weight of butyl acrylate, and a mixture of vinyl chloride/vinyl acetate in a ratio of 90/10 (weight ratio) A mixture with 60 parts by weight of a copolymer (degree of polymerization 750) was dissolved in 450 parts by weight of methyl ethyl ketone, and in this solution, 4 parts by weight of Subiron Orenno 2 Rt+ (manufactured by Hodogaya Chemical Industry Co., Ltd.), a light-shielding dye, was added. Glycerin stearate (More Body 82) is a nonionic antistatic agent that is solid at room temperature.
．． 4% by weight, 11.5% by weight of di-isomer, 1.9% by weight of tri-isomer, 1.2% by weight of others) and 0.8 parts by weight of polyoxyethylene stearyl ether, which is solid at room temperature as well. They were mixed and dissolved, and this solution was used as a coating liquid.

By applying the coating solution obtained in step 5 on one side of the polyethylene terephthalate film support using a one-roll coater and drying it in an oven for 2 minutes,
An antistatic light-shielding masking film of the present invention having a total thickness of 125 μm and an orange color was obtained.

The characteristic results of the masking film obtained in this way are
Show the table or 5th & 1st.

Example 2 Biaxially stretched polyethylene terephthalate film (+'7 x 125
μ) was used.

On the other hand, 35 parts by weight of acrylic rubber consisting of 12% by weight of acrylonitrile and 88% by weight of butyl acrylate, and a copolymer of vinyl chloride/vinyl acetate of 90/10 (weight ratio) (
Polymerization degree 800) 65 parts by weight of methyl ethyl ketone 45
0 parts by weight, and in this melt, 4 parts by weight of Subiron Red GEH (manufactured by Hodogaya Chemical Industry Co., Ltd.), a light-shielding dye, and glycerin stearate (45 parts by weight, an antistatic agent that is solid at room temperature) are added. .4% by weight,) body is 38.7% by weight
, 5.9% by weight of avian bodies, 10% of others) and 2.5 parts by weight of Carpre/Cus FPS-7 (Shiono a), a matting agent.
! ! ! (manufactured by Yakuhin Co., Ltd.) was mixed, and this solution was used as a coating liquid.

The coating solution thus obtained was applied onto one side of the polyethylene terephthalate film support using a roll tool to form an antistatic light-shielding masking film of the present invention having a total thickness of 150 μm, a red color, and a matte surface.
G.

The surface of the masking film obtained in this way can be written on with a writing instrument such as a pencil or ballpoint pen before cutting the peeling line with a knife, and even when photographed with a lithographic camera, it can be written on by reflected light to prevent halation. Work is possible.

Further, the characteristics of this masking film were similar to those of Example 1.

As a sample, the antistatic light-shielding masking film obtained in Example 1 was used, and as comparative examples, Ikesha Product-1, Competitor's Product-2, and Competitor's Product-3 were used.

Each of the above samples was cut out into five pieces each measuring 2001III+1''C and 15mm in width, and irradiated with ultraviolet rays for 465 hours using an ultraviolet carbon 7ade meter.

For each sample before and after irradiation with ultraviolet rays, the plastic support side was adhered to a copper plate 2, while a polyester adhesive tape No. 31 B) was attached to the release layer surface to serve as a reinforcing piece, and the tensile strength of the release layer was determined. The peel strength, elongation (peel layer strength), and 180 degree beer peeling (peelability) were investigated.

The results are shown in Tables 2 and 3, respectively.

Test method (1) Tensile strength and elongation of peeled B layer ・Test equipment Tensilon Universal Test UTM III (Toyo Ball) ζ“manufactured by Nin Yin Co., Ltd.) ・Test conditions γL! 1 hour 2 □ 1 ° ρ fulcrum Distance 100++++n Tensile speed 2 Q Omho/ +n1n (2) Peelability of release layer (180 degree beer ring) Test equipment Same as above Test conditions Temperature 24°C Peeling speed 300 mm/ +nin Experimental example 2 (light transmittance test) Experiment Regarding the samples before and after UV irradiation similar to those used in Example 1, for each /Z plastic film support and release layer, the light transmittance of the plastic film support and the light blocking property of the release layer were evaluated. Examined.

The results are shown in Table i14.

Test method/Test device: Spectrophotometer UV 240 (manufactured by Kinsei Seisakusho) Test conditions: Temperature: 24°C As is clear from the results shown in Table 2, the antistatic masking film of the present invention is effective against ultraviolet rays, etc. It is not susceptible to deterioration due to ultraviolet rays, and its strength hardly changes even when exposed to ultraviolet rays. On the other hand, known light-shielding masking films deteriorate due to UV irradiation and become difficult to peel off.
It can also be seen that even after peeling, the peeling layer is brittle and has deteriorated to the extent that its properties cannot be measured. In addition, the light-shielding masking film usually has a 180° beaming angle of 2
Strength of 00 g/15+am or more is required,
From the results in Table 3, it can be seen that only the antistatic type light-shielding masking film of the present invention satisfies this strength.

Furthermore, in the visible light of 600 nIfl, the plastic film support in the antistatic light-shielding masking film of the present invention is easier to see through than known ones, and the release layer has almost no light-shielding properties before and after irradiation with ultraviolet rays. It is confirmed from the m4i results that there is no change.

PtS1 Table 2 This Competitor's Product 1, Competitor's Product 2, and Competitor's Product 3 all have a release layer that is difficult to peel off when trying to remove the release layer after deterioration. It peeled off and the release layer became brittle and cracked, so it could not be tested.

For the same reason as mentioned in Table 2, the test specimens of Manufacturer's Seal 1, Ikesha's Product 2, and Competitor's Product 3 in Table 3 were +1 ir ff.
+-r>k? - Q, -n-1 Table 4 Experimental Example 3 (Comparison test of antistatic effect) The same sample used in Experimental Example 1, but before irradiation with ultraviolet rays, was used.

Test method (1) Surface leakage resistance J I 5-L-1094 (198
A method similar to 0-year reference exam 91).

(2) Charge voltage, half-life, decay rate after 60 seconds JIS-L-
1094 (1980) 3-1-1 apparatus was used. The test method is method A (half-life measurement method) and method B (electrostatic voltage).

The results are summarized in Table 5.

(Left below) From the results in PIS 5 Table and above, the antistatic light-shielding masking film of the present invention has a wavelength of 200 to 560 nanometers (+,
, ), and has good light blocking properties.

Also, the surface of this masking film is free of stickiness.
It is recognized that the polyethylene terephthalate film support and the release layer have appropriate release properties and extremely excellent antistatic properties.

Furthermore, the antistatic light-shielding masking film of the present invention is unlikely to cause deterioration of peeling fff due to photolithographic exposure, and the cut edge will not float over a long period of time (it is stable and the peeling layer cut edge with a cutter knife is stable). It was observed that the dye was sharp and, in addition, the dye did not stick on the plastic film support.

(g) Effects of the invention Since the antistatic light-shielding masking film of the present invention has the above-mentioned configuration, ■ the strength of the peeling layer is good, ■ the light-shielding property of the plus-thin film support is good, and ■ the peeling Excellent layer releasability; Even if you cut the peeling layer with a knife, no lifting will occur in the non-peelable area.
In addition to having excellent properties such as ■ sharp cut edges of the peeling layer with a cutter knife, ■ excellent light-shielding properties, ■ ability to obtain precise photorealistic objects, etc., there is no stickiness on the surface, and ■ Furthermore, dyes and pigments do not stick to the plastic film support, and furthermore, it has an extremely excellent antistatic effect.

Claims (2)

[Claims] (1) A light-shielding masking film comprising a release layer mainly made of thermoplastic plastic, rubber, or a mixture thereof on one side of a light-transmitting plastic film support, and the release layer includes a material that is solid at room temperature. An antistatic light-shielding masking film characterized by containing an antistatic agent. (2) The antistatic light-shielding masking film according to claim 1, wherein the antistatic agent is glycerin stearate.